Suggested Hand Gesture Lexicon
For Medical Image Navigation Application
In The Operating Room

Below is an appropriate set of gestures which can be used for Medical Image Navigation in the Operating Room. System actions were initially mapped with gestures in the Jester Dataset . The improved set of gestures are determined based on the results of the Hand Gesture Evaluation Survey conducted and from a previous study by Jacob et al.

System Action	Hand Gesture		Notes
Application Status
Unlock Application		Thumb Up	Thumb Up, other fingers tucked in. If there are added functionalities for confirmation, this gesture would be more appropriate for agreeing or answering yes.
Lock Application		Thumb Down	Thumb Down, other fingers tucked in. If there are added functionalities for confirmation, this gesture would be more appropriate for disagreeing or answering no.
Series Navigation
Go To Previous Series		Swipe Up	Palm facing upward. Smaller movement of four fingers pivoting upward.
Go To Next Series		Swipe Down	Palm facing downward. Smaller movement of four fingers pivoting downward.
Series Image/Slice Navigation
Go To Previous Image In The Series		Swipe Left	Palm facing camera or side. Move hand to the left.
Go To Next Image In The Series		Swipe Right	Palm facing camera or side. Move hand to the right.
Series Animation
Play Series		Swipe Down (Side View)	Side view of the hand facing screen. Palm facing downward. Smaller movement of four fingers pivoting downward.
Play Series In Reverse		Swipe Up (Side View)	Side view of the hand facing screen. Palm facing upward. Smaller movement of four fingers pivoting upward.
Stop Playing Series		Stop Sign	Open hand palm Facing Screen.
Panning
Pan Up		Slide Two Fingers Up	Point index and middle finger. Move hand or two fingers upward.
Pan Down		Slide Two Fingers Down	Point index and middle finger. Move hand or two fingers downward.
Pan Left		Slide Two Fingers Left	Point index and middle finger. Move hand or two fingers towards the left.
Pan Right		Slide Two Fingers Right	Point index and middle finger. Move hand or two fingers towards the right.
Brightness Manipulation
Increase Brightness		Push Hand Away	Palm facing camera, move open hand towards camera. Taken from Jacob et al
Decrease Brightness		Pull Hand In	Back of hand facing camera, move open hand away from camera.
Orientation Manipulation
Rotate Counter-clockwise		Swipe Counter-clockwise	Palm facing camera, wave hand to the left (counter-clockwise). Taken from Jacob et al
Rotate Clockwise		Swipe Clockwise	Palm facing camera, wave hand to the right (clockwise). Taken from Jacob et al
Zoom Level Manipulation
Zoom In		Open Two Fingers	Index and thumb touching initially, other fingers tucked in. Move index and thumb away from each other.
Zoom Out		Close Two Fingers	Index and thumb away from each other initially, other fingers tucked in. Move index and thumb towards each other until they touch.